Air conditioner



FIG. 1 is a front/right-side/top perspective view of a air conditioner showing our new design;

FIG. 2 is a front-side elevational view thereof;

FIG. 3 is a left-side elevational view thereof;

FIG. 4 is a right-side elevational view thereof;

FIG. 5 is a top-side elevational view thereof; and,

FIG. 6 is a bottom-side elevational view thereof.

The broken lines showing of the air conditioner is for illustrative purpose only and form no part of the claimed design. 

The ornamental design for an air conditioner, as shown and described. 